Hoist.



T. G. WRIGHTSON & J. M. RINGQUIST.

HOISTY APPLICATION FILED AUGJ. I917- Patented Apr. 23, 1918.

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APPLICATION FILED AueJ. 1912.

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HOIST.

APPLICATION FILED AUG-1. 19w.

Patented Apr. 23,1918.

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Specification of Letters'Patent. Pgmqgntgd App, 23, 11913;

Application filedAugust 7, 1917. serial at. 154,865.

To all whom it may concern: I

Be it known that we, THoMAs GiinMo Ds war Wn errrson and JusTUs Mne vusRING- QUIST, subjects of the King of Great Britain, both residing atTees'dale Ironworks, Thornaby-on-Tees, England, have invented a new anduseful Improvement in Hoistsfof which the following'is a specification.

This invention relates to improvements in and connected with hoistsespecially adapted for charging blast furnaces. In such hoists acarriage is raisedand lowered in or upon a hoist frame and supports askip or bucket which hangs freely from it.

The object of this invention is to provision of means for preventing theswinging of the skip as it is hoisted.

According to this invention means are provided for holding the center ofgravity of the skip a greater distance from the vertical line throughits point of suspension than the maximum acceleration or retardation ofthe carriage would tend to cause such center to move.

The invention is illustrated by the accompanying drawings. Figure 1 isadiagrammatic view of a blast furnace and hoist. Fig. 2 is a sideelevation and Fig. 3 a plan of a carriage and skip.

1 is an inclined hoist frame the top of which is above the mouth 2 of ablast furnace 3. 4 is a carriage which supports a skip 5 and has wheels6' running on rails 7 on the hoist. The carriage is raised and loweredupon the hoist frame 1 by means of a hoisting rope 8 which passes overpulleys 9, 10 to a winding drum 11, the weight of the carriage and skipbeing balanced by a counterweight 12. The skip 5 is lowered by means ofa rope 13 as hereinafter described. The rope 13 is attached to the carriage and passes around a pulley 14: to the winding drum 11.

Referring to Figs. 2 and 3, the carriage 4 consists of two crossheads15, 16 of the width of the hoist frame 1, connected together by a togglelever whose two members 17. 18 are pivoted together at 19, a frictionroller 20 being mounted upon the pivot. The hoisting rope 8 is connectedto the lower crosshead 16, and a chain 21 for supporting the skip passesover a chain wheel 22 and is also attached to thecrosshead 16.

The lowering rope 13 is attached to the and allowing the crosshead 16 toapproach the crosshead 15 under the action of the weight of theskip .5.Thelowering oftlie skip to the mouth of the furnace is controlled by therope 13. V V a y The skip is prevented from swinging by means of a lever25, one end of which is pivoted to the carriage 4 at 26, and at theother end is a crutch 27 which embraces the skip as shown. Upon thelever 25 is a roller 28 which runs in a guide 29 on the hoist frame, theguide being so formed as to cause the crutch 27 to retain the skip 5 inthe desired position in the course of usual working.

In order to facilitate the engagement of the crutch 27 with the skip 5at the commencement of its movement, a weighted arm 30 is pivoted to ahook 31 at the end of the chain 21 by which means the skip when startingis first slightly moved away from the crutch 27.

In Fig. 2, 32 is a vertical line, while the line 33 is drawn through thepoint of suspension, thus illustrating the position in which it isdesired that the skip should be retained. a

In our application for Patent No. 18 1,86 1, filed Aug. 7, 1917, we haveshown and claimed some of the features of construction shown herein. Ourclaims heroin relate to improved means for preventing the swinging ofthe skip as it is hoisted, means being provided for holding the centerof gravity of the skip a greater distance from the ver-.

tical line through its point of suspension than the maximum accelerationor retardation of the carriage would tend to cause salol renter to move.

a the center of gravity of the skip a greater distance from theverticalline through its point of suspension than the maximum acceleratlon orretardation of the carriage ,Would tend to cause such center tomove.

[end a crutch adapted to engage the skip and a guide upon the hoistframe causing the lever to hold the center of gravity ofthe skip agreater distance from the vertical line through its point of suspensionthan the maximum acceleration. or retardation of the carriagewould tendto cause such center to move. 1 V

3. A hoist frame, rails upon the hoist frame, a carriage traveling uponthe rails, means for moving the carriage, a hook depending from thecarriage, a weighted arm pivoted to the hook, a skip supported by thehook 'and'means for holding the center of gravity of the skip a greaterdistance from Copies of this patent may be obtained for the verticalline through its point of suspension than the maximum acceleration orretardation of the carriage would tend to cause such center to move.

4. A hoist frame, rails upon the hoist frame, a carriage traveling uponthe rails, means formoving the carriage, a hook depending from thecarriage, a weighted arm pivoted to the hook, a skip supported by thehook, a lever pivoted at one end to the carliage and having at its otherend a crutch adapted to engage the skip and a guide upon the hoist.frame causing the lever to hold the center of gravity of the skip agreater distance from the vertical line through its point of suspensionthan the maximum acceleration or retardation of the carriage would tendto cause such center to move.

In testimony that We claim the foregoing as our invention, We havesigned our names this 11th day of July, 1917.

T. G. WRIGHTSON. J. M. RINGQUIST.

five cents each, by addressing the Commissioner of Iatents, Washington,1). 0.

